A pulverulent Extract from Iris Versicolor or Blue Flag, an American plant, the rhizome of which is officinal in U. S. Pharm. It occurs in the form of a dark brown powder.

Med. Prop. and Action. Mild aperient cholagogue and diuretic. According to trials made with it by the Editor of the Lancet, it produces effects very similar to those occasioned by Blue Pill, Rhubarb, and Aloes. It is said seldom to fail in producing a mild catharsis, with bilious evacuations, and seems to possess the advantages of (1) not requiring the addition of a mercurial; (2), of not irritating the rectum, as Aloes is apt to do; and (3), of not having any astringency, and therefore not producing subsequent costiveness, like Rhubarb, when given alone.

Dose, gr. y. - gr. v. in the form of pill.

1662. Therapeutic Uses

In a sluggish state of the Bowels arising from torpidity of the Liver, or when the stools are pale, particularly as we find them in the intervals of overt attacks in Gouty persons, Iridin has been found one of the best aperients, much gentler than Podophylline, and more reliable when a slight cholagogue action is required to be maintained for a lengthened period, The Eclectics in America ascribe anthelmintic properties to it, and prescribe it in Syphilis, Chronic Hepatitis, Rheumatism, Scrofula, &c. (Beach.*)

* Op. cit. Lancet, Aug. 30, 1862.